18 HYDROIDS COLLECTED BY THE " HUXLEY " FROM 



brought up very few Hydroids. Here were found some large colonies 

 of Sertularella gayi, to which are fixed a few colonies of Campanularia 

 hincJvsii, a large branch of Eudendrium rameum, and fragments of 

 Plumidaria elegantula. 



Station IX, 240 fathoms. Bottom deposit — fine sand. 



This station belongs to another area, about forty miles north-west 

 of Station VII. Only a few Hydroids were taken, and all were broken 

 into fragments. Sertularia alietina and Sertularella polyzovias appear 

 to be the principal forms. 



Station XIII. 412 fathoms. Bottom deposit — sand, mud, and hard 

 ground. 



This station was not far from Station IX., but it was on the side of 

 the Atlantic slope. For Hydroids it is certainly the most interesting 

 of all the stations, as it was just beyond the range of the British 

 Hydroid fauna. At all the other stations every Hydroid (except 

 Plumularia elegantula at Station VII.) had been previously recorded 

 within the British area, and described in Hincks's classical monograph. 



At this station an Agassiz trawl was used, and it struck a large 

 bed of the coral Lopltohelia prolifera, to which many Hydroids were 

 attached. 



Amongst the larger Hydroids were Eudendrium rameum, Halecium 

 sessile, Sertularella gayi, and two new species of Bimeria {B. arborea, 

 B. hiscayana). The foreign species include Zafoea pinnata, Perisiphonia 

 pectinata, Cryptolaria luimilis, Plumidaria elegantida, and Antennopsis 

 norvegica. The occurrence of Prrisiplwnia pectinata and Cryptolaria 

 humilis extends their geographical range further north. 



Several species have their bathymetrical distribution considerably 

 extended into deeper water, namely, Eudendrium rameum, Cam- 

 panularia hincksii, Halecium sessile, Plumidaria elegantula, Plumularia 

 sctacea, and Plumularia frutescens. 



Two more foreign species were taken, which are not mentioned in 

 this report. They look something like a Cryptolaria, but possess an 

 operculum. If the colonies had been complete and in better condition 

 I would have described them. 



GYMNOBLASTEA. 



BOUGAINVILLID.ffl. 



Character of the family. Trophosome — hydranths with conical 

 hypostome, tentacles filiform in a single verticil. Gonosome — gono- 

 phores, planoblasts, or hedrioblasts (AUman, 1888). 



